MiPosaur does not turn on, even with brand new batteries

MiPosaur does not turn on, even with brand new batteries

I recently bought a boxed MiPosaur with trackball, went to go test it out but it wouldn’t turn on, no lights, sounds, motor movements, nothing. I took apart the MiPosaur but nothing seemed out of the ordinary, I was using brand new alkaline batteries and also tested it out with fully recharged rechargeables. Can anyone help?